The pond tubing is made quality PVC reinforced with an integral helix of rigid PVC, durable, lightweight, anti-aging, kink-free, high abrasion resistant and excellent corrosion-proof, is perfect for any project that requires moving water. Designed to be safe for fish, plants, and wildlife, pond tubing is Non-toxic. Its Black color blends in naturally with its surroundings. Corrugated outer surface provide high flexibility and small bending radius. Smooth inner surface are excellent for conveying liquid, air, powders. The pond hose is flexible, easily bends around sharp corners, and can be buried, adaptable to various use environments.